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Description: IEEE 802.15.4g
ABSTRACT OF THE THESIS
Implementing physical layer (PHY) of IEEE 802.15.4g standard with Direct Sequence Spread Spectrum (DSSS) using Offset Quadrature Phase Shift Keying (O-QPSK)
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Size: 30208 |
Author: akencgs@hotmail.com |
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Description: 偏移四相移相键控调制，也就是OQPSK，输出信号为OQPSK调制信号的复包络-Offset four-phase phase shift keying modulation, that is, OQPSK, the output signal for the OQPSK modulated signal complex envelope
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Size: 1024 |
Author: 傲然寒风 |
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Description: QPSK开环载波同步技术研究 频偏估计算法-Open-loop carrier synchronization QPSK Research Frequency Offset Estimation Algorithm
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Size: 1024 |
Author: wenweigao |
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Description: This file is the matlab source code for offset QPSK (OQPSK) modulation and demodulation in wireless and mobile communications
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Size: 1024 |
Author: Abbas |
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Description: Minimum Shift Keying (MSK), uses two frequencies which are separated by 1/2T and phase discontinuity is avoided in symbol boundaries. Further, MSK transmission can also be visualized as a variant of offset-QPSK technique, where sinusoidals are used for pulse shaping instead of rectangular.
-Minimum Shift Keying (MSK), uses two frequencies which are separated by 1/2T and phase discontinuity is avoided in symbol boundaries. Further, MSK transmission can also be visualized as a variant of offset-QPSK technique, where sinusoidals are used for pulse shaping instead of rectangular.
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Size: 1024 |
Author: zeusZZ |
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Description: 在C++平台上实现QPSK调制，加频偏过AWGN信道，然后采用COSTAS的方法进行载波恢复-In the C++ platform for a QPSK modulation, plus offset over AWGN channel, and then use the methods COSTAS carrier recovery
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Size: 517120 |
Author: wwyy |
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Description: In this simulink model , QPSK modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal
is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.-In this simulink model , QPSK modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal
is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.
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Size: 8192 |
Author: quail |
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Description: bit error rate calculation for ofdm using qpsk modulation with frequency offset
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Size: 1024 |
Author: junaid Anees |
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Description: QPSK and offset QPSK(MSK) wave generation
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Size: 1024 |
Author: sha |
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Description: difference between quadrature phase shift keying and offset quadrature phase shift keying
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Size: 184320 |
Author: Kanava Jenni |
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Description: This paper considers frequency-domain receiver
design for OQPSK signals (Offset Quaternary Phase
Shift Keying). It is shown that conventional QPSK receivers
are not suitable to OQPSK schemes since they
lead to significant interference between in-phase (I) and
quadrature (Q) components. To overcome this problem
we propose several linear receivers where there is no
I-Q interference. Our receivers are suitable to OQPSK
schemes, significantly outperforming frequency-domain receivers
designed for QPSK modulations.
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Size: 113664 |
Author: 吕立圣 |
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Description: Altem公司quartus
II 8．1开发环境下，完成了中频全数字解调器的FPGA实现，并对数
字下变频、载波同步、位同步等解调器的核心模块设计进行了详细的分析和说明，给出
了实现框图和仿真波形。同时在本设计中应用了Altera公司的NiosII软核处理器技术，
用于载波的大频偏校正和解调器各个部分的监测和控制。最后给出了QPSK中频全数字
解调器关键性能指标的测试方法和测试结果，测试结果表明本设计达到了预期的性能指
标要求。-The Algorithm is converted to HDL description for FPGA realization．The designs of the core Modules of demodulator, including digital down-conversion，carrier ring，bit synchronization loop design, are described in detail．And a block diagram and simulated waveforms are provide in the latter part．Also the soft-core processor technology of Altera’s NiosII is applied in the design for carrier frequency offset correction and the monitoring and control of the separate parts of demodulator．Finally, the test methods and results of key performance indicators of the IF Demodulator QPSK are given to show that the design given in this paper can reach the performance requirements expected.
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Size: 4328448 |
Author: zhuimeng |
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Description: 介绍通信系统基本结构的simulink仿真程序，包括了脉冲成形，OOK，BPSK，4-ASK，QPSK，Offset-QPSK,MSK,16-QAM的调制解调simulink仿真，可以观察的调制波形和误码率。-This tutorial program introduces the infrastructure of commnication system in simulink form.It contains the simulation of Pulse Shape,OOK，BPSK，4-ASK，QPSK，Offset-QPSK,MSK,16-QAM, and the result form of waveline and error rate can be showed in simulation.
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Size: 1154048 |
Author: 谢翔 |
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Description: 根据软件无线电的思想，提出了一种新颖的数字信号处理算法，对QPSK信号的相位进行数字化处理，从而实现对QPSK信号的解调.该算法允许收发两端载波存在频差，用数字锁相实现收发端载波的同步，在频偏较大的情况下，估算频偏的大小，自适应设置环路的带宽，实现较短的捕获时间和较好的信噪性能。整个设计基于XILINX公司的ISE开发平台，并用Virtex-II系列FPGA实现。用FPGA实现调制解调器具有体积小、功耗低、集成度高、可软件升级、扰干扰能力强的特点，符合未来通信技术发展的方向。-According to the idea of software radio, a novel digital signal processing algorithm, the phase of QPSK digital signal processing, enabling the demodulation of QPSK signals. This algorithm allows the sending and receiving ends of the carrier frequency difference exists, using digital phase-locked to achieve synchronization of sending and receiving end of the carrier, in the case of large frequency offset, frequency offset estimation of the size, adaptive set the loop bandwidth to achieve shorter acquisition time and better noise performance. The whole design is based on the company XILINX ISE development platform, and Virtex-II series with the FPGA. FPGA realization of a modem with a small size, low power consumption, high integration, software upgrades available, the characteristics of strong interference interference, in line with the future direction of ICT development.
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Size: 64512 |
Author: 马文 |
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Description: QPSK调制的载波频偏估计，是一个可以调用的函数。接收端进行了一系列的处理。经典的Kay法-QPSK-carrier frequence offset estimation_ kay
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Size: 1024 |
Author: liujingaiseng |
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Description: QPSK调制的载波频偏估计，是一个可以调用的函数。接收端进行了一系列的处理。经典的Fitz法-QPSK-carrier frequence offset estimation_ Fitz
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Size: 1024 |
Author: liujingaiseng |
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Description: Differential PSK (DPSK)
Inexpensive
Quadrature Phase Shift Keying (QPSK)
Twice as spectrally efficient than BPSK
Offset QPSK (OQPSK)
reduce envelope variation
π/4 QPSK
reduces envelope variations to a lesser extent
than OQPSK can be noncoherently detected-Differential PSK (DPSK)
Inexpensive
Quadrature Phase Shift Keying (QPSK)
Twice as spectrally efficient than BPSK
Offset QPSK (OQPSK)
reduce envelope variation
π/4 QPSK
reduces envelope variations to a lesser extent
than OQPSK can be noncoherently detected
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Size: 147456 |
Author: j |
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Description: 使用matlab对无线通信中重要的调制技术QPSK进行了仿真设计，包括调制，信道环境模拟，解调，最重要的是解决了无线通信中的载波同步问题，对频偏和相偏进行了估计，也实现了码元同步。-Use matlab important wireless communication QPSK modulation technique simulation design, including modulation, channel environment simulation, demodulation, the most important thing is to solve the wireless communications carrier synchronization problem, frequency offset and phase deviation were estimated, also achieved a symbol synchronization.
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Size: 9216 |
Author: gaochuang |
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Description: 信号利用QPSK调制，采用全数字化的频偏估计方法(A full digital frequency offset estimation method using QPSK modulation)
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Size: 203776 |
Author: cortana
|
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Description: 该工程实现对单载波系统QPSK的频偏估计算法。调相信号在接收机相干解调时需要同频同相的参考载波，而发射机和接收机之间往往存在频率偏差，为了消除这种误差，必须在软件层面实现。使用了QPSK四相调制的信号特点进行载波频偏估计，经验证，效果较好。(This project implements frequency offset estimation algorithm for single carrier system QPSK. The phase modulation signal needs the same frequency reference carrier in the coherent demodulation of the receiver, and the frequency deviation often exists between the transmitter and the receiver. In order to eliminate this error, it must be implemented on the software level. The carrier frequency offset estimation is carried out by using the signal characteristics of QPSK four phase modulation.)
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Size: 2048 |
Author: 呆_呆 |
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